Traceback (most recent call last):
  File "/Users/kparaju/Documents/repos/servo/tests/wpt/run.py", line 49, in <module>
    sys.exit(0 if main() else 1)
  File "/Users/kparaju/Documents/repos/servo/tests/wpt/run.py", line 45, in main
    kwargs = set_defaults(args)
  File "/Users/kparaju/Documents/repos/servo/tests/wpt/run.py", line 36, in set_defaults
    wptcommandline.check_args(rv)
  File "/Users/kparaju/Documents/repos/servo/_virtualenv/lib/python2.7/site-packages/wptrunner/wptcommandline.py", line 144, in check_args
    set_from_config(kwargs)
  File "/Users/kparaju/Documents/repos/servo/_virtualenv/lib/python2.7/site-packages/wptrunner/wptcommandline.py", line 137, in set_from_config
    new_value = kwargs["config"].get(section, {}).get_path(config_value)
  File "/Users/kparaju/Documents/repos/servo/_virtualenv/lib/python2.7/site-packages/wptrunner/config.py", line 18, in get_path
    path = self[key]
KeyError: 'tests'